Provided is an exercise machine system capable of adjusting a weight by using flow weights, and more particularly, to an exercise machine system capable of adjusting a weight by adjusting the number of flow weights such as short balls and loading the flow weights in a flow weight loading part of an exercise machine. The exercise machine system capable of adjusting a weight by using flow weights, which is capable of allowing a user to perform an exercise with a desired weight by setting up an exercise weight and supplying the flow weight parts to the flow weight loading part based on the preset exercise weight. Therefore, it is possible to eliminate the inconvenience to the user having to manually adjust the weight.